Samsung BD-E8900 - Servicing Precautions; General Servicing Precautions; Insulation Checking Procedure

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1.Precautions

1.2.ServicingPrecautions

CAUTION

Beforeservicingunitscoveredbythisservicemanualanditssupplements,readandfollowtheSafetyPrecautions

sectionofthismanual.

NOTE

Ifunforeseencircumstancescreateconictbetweenthefollowingservicingprecautionsandanyofthesafetyprecautions,

alwaysfollowthesafetyprecautions.Remember:SafetyFirst.

1.2.1.GeneralServicingPrecautions

1)a.Alwaysunplugtheinstrument’sACpowercordfromtheACpowersourcebefore(1)removingorreinstallingany

component,circuitboard,moduleoranyotherinstrumentassembly,(2)disconnectinganyinstrumentelectricalplugor

otherelectricalconnection,(3)connectingatestsubstituteinparallelwithanelectrolyticcapacitorintheinstrument.

b.Donotdamageanyplug/socketB+voltageinterlockswithwhichinstrumentscoveredbythisservicemanual

mightbeequipped.

c.DonotapplyACpowertothisinstrumentandoranyofitselectricalassembliesunlessallsolid-statedeviceheat

sinksarecorrectlyinstalled.

d.Alwaysconnectatestinstrument’sgroundleadtotheinstrumentchassisgroundbeforeconnectingthetestinstrument

positivelead.Alwaysremovethetestinstrumentgroundleadlast.

NOTE

RefertotheSafetyPrecautionssectiongroundleadlast.

2)Theserviceprecautionsareindicatedorprintedonthecabinet,chassisorcomponents.Whenservicing,followthe

printedorindicatedserviceprecautionsandservicematerials.

3)Thecomponentsusedintheunithaveaspeciedameresistanceanddielectricstrength.Whenreplacingcomponents,

usecomponentswhichhavethesame.Componentsidentiedbyshading,inthecircuitdiagramareimportantforsafety

orforthecharacteristicsoftheunit.Alwaysreplacethemwiththeexactreplacementcomponents.

4)Aninsulationtubeortapeissometimesusedandsomecomponentsareraisedabovetheprintedwiringboardfor

safety.Theinternalwiringissometimesclampedtopreventcontactwithheatingcomponents.Installsuchelements

astheywere.

5)Afterservicing,alwayscheckthattheremovedscrews,components,andwiringhavebeeninstalledcorrectlyandthat

theportionaroundtheservicedparthasnotbeendamagedandsoon.

Further,checktheinsulationbetweenthebladesoftheattachmentplugandaccessibleconductiveparts.

1.2.2.InsulationCheckingProcedure

DisconnecttheattachmentplugfromtheACoutletandturnthepowerON.Connecttheinsulationresistancemeter(500V)

tothebladesoftheattachmentplug.Theinsulationresistancebetweeneachbladeoftheattachmentplugandaccessible

conductiveparts(seenote)shouldbemorethan1Megohm.

NOTE

Accessibleconductivepartsincludemetalpanels,inputterminals,earphonejacks,etc.

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